Chemistry Answers

Calculate the molality of a 0.410 molar aqueous solution whose density is 1.15 g/mL.

A storage tank contains 2 moles of Ar, 3 moles of O2, and 5 moles

of N2 at a total pressure of 1000 torr. Calculate partial pressure of

each gas.

What is the entropy change of the reaction below at 298 K and 1 atm pressure? N2(g) + 3H2(g) → 2NH3(g) S 0 298 (J/mol•K) 191.5 130.6 192.3

(a) –198.7 J/K

(c) –129.7 J/K

(b) 76.32 J/K

(d) 303.2 J/K

Write the balanced COMPLETE ionic equation for the reaction when FeBr₃ and (NH₄)₂S are mixed in aqueous solution. If no reaction occurs, simply write only NR.

how many atoms of calcium are in 6 moles of Ca?

You have 2.2 mol Xe and 4.0 mol F₂, but when you carry out the reaction you end up with only 0.25 mol XeF₄. What is the percent yield of this experiment?

Xe(g) + 2 F₂ (g) → XeF₄ (g)

A 500cm3 of solution is prepared by dissolving 0.25g of CaCo3 in excess HCl.Ca2+ ions concentration in the solution in ppm?

What is the total number of moles of ions present in a solution after mixing 125cm3 of 0.2M NaOH and 125cm3 of 1M H2SO4

An aqueous solution K2SO4.Cr(SO4)3.12H2O contains 2.08gdm-3 of Cr3+ ions .what is the SO4^2- concentration in moldm-3 in this solution

How many molecules of iron(III) carbonate does Tina need to react with 5.0 x 10^25 formula

units of HCI? What is the mass of this quantity of iron(Ill) carbonate?